Method of forming separable fastener stringers



1940- D. MARINSKY 2,212,545

METHOD OF FORMING SEPARABLE FASTENER STRINGERS Filed March 6, 1957AITToRNE Patented Aug. 27, 1940 UNITED STATES PATENT orrics 1 METHOD 6FFORMING 'SEPARABLE FASTENER STRINGERS Davis Marinsky, Bronx, N. Y.,assignor to Whitehall Patents Corporation, Bronx, N. Y., a corporationof New York Application March's, 1937, Serial No. 129,321

'7 Claims.

tapesv to retain the same against displacement therefrom and especiallyin the die casting of plastic or thermoplastic links on the stringersand cementing the same thereon so as to form a secure mounting oranchoring of the links on 154 said stringers; and with these andotherobjects in View, the invention consists in a device of the class and forthe purpose specified, made in accordance with the method more fullyhereinafter described and claimed.

The invention is fully disclosed in the following specification, ofwhich the accompanying drawing forms a part, in which the separate partsof my improvement are designated by suitable reference characters ineach of the views, and in which:

Fig. l is a plan view of a part of two stringers of a separable fastenerin coupled relation with each other.

Fig. 2 is a sectional view through one stringer illustrating one methodof treating the same according to my invention.

Fig. 3 is a view similar to Fig. 2 showing a modification in the form ofthe stringer tape employed.

Fig. 4 is a sectional view showing another method of applying anadhesive or solvent to the stringer tape.

Fig. 5 is a diagrammatic view showing another method of applying asolvent; and,

Fig. 6 is a diagrammatic view illustrating another step in the processwhich I employ.

My invention relates to what are commonly known as separable fastenersemploying stringers l9, [0a, as seen in Fig. 1, each having a beadededge portion I I, Ila, with coupling links or scoops l2, IZa attached tosaid beaded edges and adapted to be interlocked one with the other in.the manner illustrated in coupling the stringers l0, Illa together. Itis customary with devicesv of this type to employ a slidermovable'longitudinally of the stringers or the links thereof to cou-vple anduncouple the same, but as such devices are commonly known in'theart, they areomitted 55 inthe present disclosure for the sake; ofclarity,

especially in that they form no part of the present invention. a

My invention relates primarily tothe die cast ing of thelinks, scoops orother elements directly onto the tape or mounting member andparticularly the casting of plastic or thermoplastic elements, such forexample, as cellulose acetate elements on the tape or mounting member.After the links or elements are attached, the same may also be glued orcemented in position in the manner more fully hereinafter described; Theinvention will be described as applicable to one,

tape, it being understood that the companion tape is made in a similarmanner.

. After the links l2 have been die cast on thebeaded edge lfl of thetape, the tape or the oppo site edge portion 13 thereof is passedthrough a tank or trough i l containing a solution l5 capable of gluingor adhering the links it to the In employing links such as composed ofThe time of submerging or passing the tape [it through the solution 15will depend entirely upon the size of the tape Ill and the distance tobe traveled by the solution, under predetermined conditions. tion 15 inthe manner indicated in Fig. 2, I may, in some instances, pass the linksI2 attached to the stringer through, a pressure ele-p ment, such forexample, as spring pressed belts l6 shown in Fig. 6 of the drawing toapply slight pressure to the links I2 or that portion thereof housingthe beaded edge H of the tape, or, in other words, to hold the linksunder compression while the solvent is drying. The spring actuatedplates or guides [6a are employed as backings for the belt it. However,the treatment of applied pressure as shown in Fig. 6 of the drawing isonly necessary where the fastener is to be subjected to excessive stressand strain, where it would be desirable to establish a more securebinding or cementing of the links on the tape. In some instances, theapplication of a slight amount of heat may also be provided by. passingthe links through a suitable heater, preferably of the electric type,whereby the links will be exposed to heat and. pressure immediatelyafter the application of the solvent l5 thereto. It will also beunderstood at this. time that while I have, shown my invention. asapplicable to. the

After the passage through the solucoupling links of separable fasteners,the same may also apply to end stop members or elements employed at theends of the stringers. Stillfurther, my invention is not necessarilylimited to devices of the specific kind and class herein specified, asthe same may also be used in other arts where it is desirable to securethe thermoplastic or other element to a fabric or fibrous member orsupport.

In Fig. 3 of the drawing, I have shown a slight modification wherein astringer tape ND is provided, the beaded edge I lb of which hasinterwoven therein a plurality of longitudinally arranged andcircumferentially spaced threads l1. These threads I! are preferablyformed of rayon or some similar material which is soluble in the samesolvent as the material of which the links are formed. Thus, it will beseen that as the tape is saturated the adjacent surfaces of the linkwhich contact with the tape will besoftened and form an adhesive bindersecuring those links to the tape as above described, and. this binderwill flow together with the softened material of the threads. When thematerial dries, the result will be an integral uniting of the links tothe tape.

In Fig. 4 of the drawing, I have shown another method of applying thesolvent Hi to the stringer tape H) by rotating a fibrous or otherapplicator wheel l8 through a tank or trough l9 containing the solvent15 and using the absorbent wheel [8 as a means for transferring thesolvent to the tape III at a point adjacent the links. I2 in order toprovide a quicker transmission of the solvent to the beaded edge II ofthe tape Ill and in this 3, way save the amount of solvent used, to somedegree. A solvent such as acetone dries quickly and does not affect thefabric of the tape in any way, while at the same time, it provides avery effective means of securing the links to the tape.

In this connection, it should be borne in mind that in the manufactureof stringers of the kind under consideration, it is customary tomanufacture the product in long 'tapes on which are spaced thepredetermined desired lengths of link groups forming stringers of thedesired length. Therefore, these link tapes may be passed through thesolvent in a'continuous operation before the separate stringer lengthsare severed from the long tape. This also applies to the treatment ofthe applied pressure and/or heat and pressure when desired or required.When heat is also employed to aid in securing the links of the tapes,the amount of heat will only be sufficient to expedite the drying of thesolvent employed and not sufficient to effect the structure of the linkin any way, at least, in so far as its external contour is concerned.

In Fig. 5 of the drawing, I have shown another method of applying theadhesive or solvent to the stringer tapes, which consists in providing asuitable container 20 for a solvent such as acetone,

the container having a tube 2! mounted in the cap or cover 22 thereof.The free end 23 of the tube 2! may be enlarged horizontally, if desired,where it contacts one side surface of a mounting tape 24 adjacent thelinks 25 thereof, and at the opposite side of the tape 2d is acorrespondingly formed suction tube 26 exposed to a suitable means forcreating a suction so that the solvent will be drawn upwardly throughthe tube 2! from the container 20. It is understood that the tape 24 issufiicient porous to permit this operation and as it moves between thepipes or tubes 2i and 26 would be saturated sufiiciently to extend thesolvent into the beaded edge 24a of the tape, and

a small opening 22a is provided in the cap or cover 22. In other words,the structure shown in Fig. 5 operates substantially the same as thatshown in Fig. 4 but will permit higher speed action, thus increasing theproduction of the stringers in question.

One of the distinctive features of my invention resides in the provisionof a fibrous mounting member or body to'which the links or otherelements are attached, which includes the rayon or other similar type ofthreads interwoven with the body or member to aid in establishng thegluing or cementing operation. While I have mentioned the application ofcertain types of solvents to the fibrous member or body, the form ortype of cement used will depend entirely upon the type of links orelement employed or to be attached thereto.

In some instances, I may first treat the tape or mounting member with asolvent and then cast the links, thereon, it being understood, that thecasting operation extends the plastic mate-.

rial into the interstices of the braid of a fabric supporting member.

Having fully described'my invention, what I claim as new and desire tosecure by Letters Patent, is: i

1. The herein described method of securing plastic elements of anelongated fibrous mounting member which consists in first attaching theelements to said member at longitudinally spaced intervals, then passingsaid member between a solvent supply tube and a suction tube disposed atopposite sides of said member and in common alinement with each other todraw a solvent through said supply tube and apply the-same to saidmember, said solvent extending through said member to contact thesurfaces of the elements disposed on said member to cement the elementsthereon, and then holding said elements under compression while thesolvent is drying.

2. The herein described method of manufac-.

turing devices of the character described, which consists in providingafibrous mounting member,

arranging a thread longitudinally of one edge portion of said member soas to expose the thread through the outer surface of the member at closeintervals longitudinally of said member, die casting thermoplasticelements directly on said edge of the member at longitudinally spacedintervals to contact said thread and to form surfaces on said elementsconforming substantially to-the irregular surface contour of themounting member, said thread and said elements, independent of saidmounting member, being soluble in at least one common solvent, then;applying to said member adjacent said elements acommon solvent turingdevices of the character described, which consists in providing afibrous mounting member, die casting thermoplastic elements directly onone edge of said member at longitudinally spaced intervals and to .formsurfaces on said elements of an irregular contour substantiallyconforming to the irregular contour of the mounting member, said memberhaving at least one thread extending longitudinally thereof contact-..

ing each of the elements applied to said member,

extend by capillary action to the thread and that part of the elementsengaging said member to cement and secure the elements to said member.

4. The herein described method of manufacturing devices of the characterdescribed, which consists in providing a fibrous mounting member, diecasting thermoplastic elements directly on one edge of said member atlongitudinally spaced intervals and to form surfaces on said elements ofan irregular contour substantially conforming to the irregular contourof the mounting member, said member having at least one thread extendinglongitudinally thereof contacting each of the elements applied to saidmember, said thread and elements being soluble in at least one commonsolvent, then applying the solvent to said member adjacent said elementsto extend by capillary action to the thread and that part of theelements engaging said member to cement and secure the elements to saidmember, and then holding the elements under pressure for a period oftime during the drying of said solvent in securely attaching theelements to said member.

5. The herein described method of manufacturing devices of the characterdescribed, which consists in providing a fibrous mounting member havingat least one rayon thread arranged therein and exposed therethrough atlongitudinally spaced intervals, die casting thermoplastic elementsdirectly upon. said mounting member and contacting the rayon threadtherein and forming surfaces engaging the mounting member which conformwith the irregular contour of the mounting member, then treating saidmember adjacent said elements with a solvent common to said rayon threadand thermoplastic elements, said solvent extending through said memberto engage the surfaces of the elements attached thereto, including therayon thread, to cement said elements to said member by said solvent andthat portion of the thread dissolved by said solvent.

6. Theherein described method of manufacturing devices of the characterdescribed, which consists in providing a fibrous mounting member havingat least one'rayon thread arranged therein and exposed therethrough atlongitudinally spacedintervals, die casting thermoplastic elementsdirectly upon said mounting member and contacting the rayon threadtherein and forming surfaces engaging the mounting member which conformwith the irregular contour of the mounting member, then treating saidmember with a solvent common to said rayon thread and thermoplasticelements, said solvent extending through said member adjacent saidelements to engage the surfaces of the elements attached thereto,including the rayon thread, to cement said elements to said member bysaid solvent and that portion of the thread dissolved by said solvent,applying pressure to said elements during the hardening and drying ofthe solvent, and exposing the elements to heat when subjected to saidapplied pressure.

7. The herein described method of forming separable fastener stringers,which consists in providing an elongated fabric stringer tape, diecasting thermoplastic links directly upon one edge portion of the tapeat longitudinally spaced intervals, applying a solvent for said linksdirectly to that portion only of the tape closely adjacent the linksattached thereto to contact the inner surfaces of the links wherearranged on the tape in cementing the links thereto, and then passingthe links through pressure means in securely attaching the links to thetape prior to the setting of said solvent.

I DAVIS MARINSKY.

